Impact of unsustainable sand mining Undercutting and collapse of - TopicsExpress

Impact of unsustainable sand mining Undercutting and collapse of river banks, loss of adjacent land and/or structures, upstream erosion as a result of an increase in channel slope and changes in flow velocity, as well as downstream erosion due to increased carrying capacity of the stream, downstream changes in patterns of deposition, and changes in riverbed and habitat type. Threats to water security resulting from the loss of groundwater storage due to lowering of the water table. Example: The water table in all the wells in the Pampa river valley in Kerala has fallen significantly — by an average of 3-4m, and up to 6m in some areas. Decreased protection from beachfront erosion, especially during ocean disasters. Mining and dredging activities, poorly-planned stockpiling and uncontrolled dumping of overburden, and chemical/fuel spills cause reduced water quality for downstream users, increased cost for downstream water treatment plants and poisoning of aquatic life.

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